Определите функции глаголов to have, to be, to do 1. SMS

Обусловьте функции глаголов to have, to be, to do 1. SMS is one for the most-used services in second-generation mobile telecommunications systems. 2. Portability does in fact promote competition, it drives down prices, and keeps providers competitive. 3. We have a lot of problems with existing equipment. 4. However, this methodology has proven to be disadvantageous to the CATV companies, because it is extremely difficult to send signals upstream. 5. My friend is to finish working at the mashine by June.